Sign post



FIG. 1 is a perspective view of a sign post showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a side elevation thereof as seen from the right of FIG. 2;

FIG. 4 is a side elevation thereof as seen from the left of FIG. 2;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sign post, as shown and described. 